(CNN) - Trayvon Martin's girlfriend, talking to him on the telephone, heard the teenager saying "get off, get off," in the moments before his cell phone cut off and he was shot dead, according to a recording released Friday of the girl's interview with a prosecutor.

Another witness, however, seems to put Martin on top of George Zimmerman for at least part of the struggle, according to another recording.

"Where I first walked out there, the black guy was on top, and the only reason I can tell that was because the guy that was on the ground under him at that point wrestling was definitely a lighter color," the witness, whose name has not been made public, said in the interview.

Martin was African-American. Zimmerman is a white Hispanic.

Another witness said the heavier of the two appeared to be on top.

"I know after seeing the TV of what's happening, comparing their pictures, I think Zimmerman was definitely on top because of his size," the witness said.

The recordings provide the most detailed look yet into previously reported witness statements detailing the last moments of Martin's life.

Editor’s Note: Rinku Sen is the President and Executive Director of the Applied Research Center (ARC) and the publisher of Colorlines.com.

By Rinku Sen, Special to CNN

(CNN) –With the news that, for the first time in U.S. history, the majority of American babies are not white, it should put to rest use of the term “minorities” as a reference to America’s black, Latino, Asian and Native American residents.

Nearly 30 years ago, I learned to think of myself as a person of color, and that shift changed my view of myself and my relationship to the people around me.

It is time for the entire nation, and our media in particular, to make the same move.

About In America

What defines you? Maybe it’s the shade of your skin, the place you grew up, the accent in your words, the make up of your family, the gender you were born with, the intimate relationships you chose to have or your generation? As the American identity changes we will be there to report it. In America is a venue for creative and timely sharing of news that explores who we are. Reach us at inamerica@cnn.com.